“It’s just the story of Meredith and Cristina,” shares series creator Shonda Rhimes. “It’s really going to be original. I don’t think we’ve ever told a story the way we’re telling a story in this episode.”

Rhimes declines to specify what genre the standalone installment will fall into, hinting only that, “It’s not a regular episode. I won’t be able to explain what the gimmick is until I’ve seen it shot and we’ve decided on the visual style of it. But it is going to be fairly different.”

What do you think Rhimes has up her sleeve for Mer and “Her Person?” Hit the comments with your predictions. And remember, Season 9 of Grey’s Anatomy premieres Thursday, Sept. 27 at 9/8c.